mirror of
https://github.com/AsahiLinux/u-boot
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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/*
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* Copyright (C) 2005-2008 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/portmux.h>
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#include "sm.h"
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void clk_init(void)
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{
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uint32_t cksel;
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/* in case of soft resets, disable watchdog */
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sm_writel(WDT_CTRL, SM_BF(KEY, 0x55));
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sm_writel(WDT_CTRL, SM_BF(KEY, 0xaa));
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#ifdef CONFIG_PLL
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/* Initialize the PLL */
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sm_writel(PM_PLL0, (SM_BF(PLLCOUNT, CONFIG_SYS_PLL0_SUPPRESS_CYCLES)
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| SM_BF(PLLMUL, CONFIG_SYS_PLL0_MUL - 1)
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| SM_BF(PLLDIV, CONFIG_SYS_PLL0_DIV - 1)
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| SM_BF(PLLOPT, CONFIG_SYS_PLL0_OPT)
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| SM_BF(PLLOSC, 0)
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| SM_BIT(PLLEN)));
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/* Wait for lock */
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while (!(sm_readl(PM_ISR) & SM_BIT(LOCK0))) ;
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#endif
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/* Set up clocks for the CPU and all peripheral buses */
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cksel = 0;
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if (CONFIG_SYS_CLKDIV_CPU)
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cksel |= SM_BIT(CPUDIV) | SM_BF(CPUSEL, CONFIG_SYS_CLKDIV_CPU - 1);
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if (CONFIG_SYS_CLKDIV_HSB)
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cksel |= SM_BIT(HSBDIV) | SM_BF(HSBSEL, CONFIG_SYS_CLKDIV_HSB - 1);
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if (CONFIG_SYS_CLKDIV_PBA)
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cksel |= SM_BIT(PBADIV) | SM_BF(PBASEL, CONFIG_SYS_CLKDIV_PBA - 1);
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if (CONFIG_SYS_CLKDIV_PBB)
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cksel |= SM_BIT(PBBDIV) | SM_BF(PBBSEL, CONFIG_SYS_CLKDIV_PBB - 1);
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sm_writel(PM_CKSEL, cksel);
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#ifdef CONFIG_PLL
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/* Use PLL0 as main clock */
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sm_writel(PM_MCCTRL, SM_BIT(PLLSEL));
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#ifdef CONFIG_LCD
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/* Set up pixel clock for the LCDC */
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sm_writel(PM_GCCTRL(7), SM_BIT(PLLSEL) | SM_BIT(CEN));
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#endif
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#endif
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}
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unsigned long __gclk_set_rate(unsigned int id, enum gclk_parent parent,
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unsigned long rate, unsigned long parent_rate)
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{
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unsigned long divider;
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if (rate == 0 || parent_rate == 0) {
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sm_writel(PM_GCCTRL(id), 0);
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return 0;
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}
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divider = (parent_rate + rate / 2) / rate;
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if (divider <= 1) {
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sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN));
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rate = parent_rate;
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} else {
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divider = min(255, divider / 2 - 1);
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sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN) | SM_BIT(DIVEN)
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| SM_BF(DIV, divider));
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rate = parent_rate / (2 * (divider + 1));
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}
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return rate;
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}
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